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Activation energy of bromate/bromide reaction in acidic solution

  • Thread starter sspanzer
  • Start date
  • #1
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1. given/known data
My work is about calculating activation energy of bromate/bromide reaction.
Besides KBr and KBrO3, phenol and methy red is also used. The Bromine produced react rapidly with phenol, once all the phenol is consumed, the bromine will decolorize the methyl orange indicator. In that way the time for a reaction to reach a certain point can be determined


Homework Equations


BrO3- (aq) + 5 Br- (aq) + 6 H+ (aq) → 3 Br2 (aq) + 3 H2O (l)

My question is, what is the gel-like substances i found at the end of the reaction?
 
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Answers and Replies

  • #2
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a guess

I would guess that it is 2,4,6TribromoPhenol : http://chemicalland21.com/specialtychem/perchem/2,4,6-TRIBROMOPHENOL.htm
But then I have a question for you : do you have an experiment guide for the experiment - I found the one from Bangor University, but there is no info about conentrations and so - I would be glad if you could send me a mail if you have it.
best wishes
finn
 
  • #3
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concentrations for a 3 min reaction are as follows:
0.01M phenol (0.94g in 1dm3) 70cm3
0.1M KBr (11.9g to 1 dm3) 35cm3
0.02M KBr03 (3.34g in 1 dm3) 35cm3
0.5M H2SO4 35cm3

hope this helps
 
  • #4
did you manage to find the activation enthalpy? And when plotting a 1/T against natrual log of rate graph false origins are ok because I only need the gradient?
 

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